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3 years ago

Toby found a $52 wallet on the clearance

Mathematics

1 answer:

Mazyrski [523]3 years ago

6 0

Answer:

A. $22.10

Step-by-step explanation:

52 x 0.4 = 20.8

20.8 x 1.0625 = 22.1

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As for $65 each and included a 60% mark<br> +

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Answer:

revenue: $104 profit: $39

Step-by-step explanation:

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3 years ago

Express 0.25 as a whole Number

tatyana61 [14]

Answer:

Step-by-step explanation:

100 as the denominator. You should slide it twice to the right. like this 0.25

2.5 then 25

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3 years ago

What is the ratio of the two values and what new value do they produce? 4m in 2 min

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4 years ago

Answer the following questions:

Fofino [41]

For binomials raised to exponent 2, the answer would follow the steps: 1. square the first term. 2. multiply by 2 the product of the two terms. 3. square the last term.

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3. x² - 25
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3 years ago

The mean balance of all checking accounts at a bank on December 31, 2011, was $850. A random sample of 55 checking accounts take

love history [14]

Answer:

There is insufficient evidence to conclude that the mean balance of accounts has decreased during this period

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = $850

Sample mean, $\bar{x}$ = $790

Sample size, n = 55

Alpha, α = 0.01

Sample standard deviation, s = $200

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 850\text{ dollars}\\H_A: \mu < 850\text{ dollars}$

We use one-tailed t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{790 - 850}{\frac{200}{\sqrt{55}} } = -2.224$

Now, $t_{critical} \text{ at 0.01 level of significance, 54 degree of freedom } = -2.397$

Since,

$t_{stat} > t_{critical}$

We fail to reject the null hypothesis and accept the null hypothesis. There is insufficient evidence to conclude that the mean balance of accounts has decreased during this period.

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4 years ago